Merge SD stuff into fusee-secondary. Switch diskio to single-sector reads temporarily

fusee/fusee-secondary/src/supplies.c

@@ -0,0 +1,30 @@
+/**
+ * Fusée power supply control code
+ *  ~ktemkin
+ */
+
+#include "supplies.h"
+#include "lib/printk.h"
+
+// FIXME: replace hwinit with our own code
+#include "hwinit/max7762x.h"
+
+/**
+ * Enables a given power supply.
+ *
+ * @param supply The power domain on the Switch that is to be enabled.
+ */
+void supply_enable(enum switch_power_supply supply)
+{
+    switch(supply) {
+        case SUPPLY_MICROSD:
+            max77620_regulator_set_voltage(SUPPLY_MICROSD_REGULATOR, SUPPLY_MICROSD_VOLTAGE);
+            max77620_regulator_enable(SUPPLY_MICROSD_REGULATOR, true);
+            return;
+
+        default:
+            printk("ERROR: could not enable unknown supply %d!\n", supply);
+            return;
+    }
+}
+